This message would come up on older Euro4 Volvo diesels on the V50 when the DPF additive was low, ie had not been serviced by a Volvo dealer and additive was running out. You would get this message on these cars after fuel has been added and additive tank was low.
On your car you will not have the additive as far as I am aware because the DPF design changed to a life item.
If your are only doing 12 miles a day, then probably the DPF is not able to regenerate properly, hence the message.
Go for a good blast down the motorway for 10 miles or so and hopefully it may clear.
I should add, get codes read by a dealer to confirm.
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